MIPS: Track storage types of instance variables.

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
   code->set_stack_slots(GetStackSlotCount());
   code->set_safepoint_table_offset(safepoints_.GetCodeOffset());
   if (FLAG_weak_embedded_maps_in_optimized_code) {
     RegisterDependentCodeForEmbeddedMaps(code);
   }
   PopulateDeoptimizationData(code);
   for (int i = 0 ; i < prototype_maps_.length(); i++) {
     prototype_maps_.at(i)->AddDependentCode(
         DependentCode::kPrototypeCheckGroup, code);
   }
+  for (int i = 0 ; i < transition_maps_.length(); i++) {
+    transition_maps_.at(i)->AddDependentCode(
+        DependentCode::kTransitionGroup, code);
+  }
 }
 
 
 void LChunkBuilder::Abort(const char* reason) {
   info()->set_bailout_reason(reason);
   status_ = ABORTED;
 }
 
 
 void LCodeGen::Comment(const char* format, ...) {
@@ skipping 2574 matching lines @@
                               EMIT_REMEMBERED_SET,
                               check_needed);
   }
 
   __ bind(&skip_assignment);
 }
 
 
 void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
   Register object = ToRegister(instr->object());
-  Register result = ToRegister(instr->result());
+  if (!FLAG_track_double_fields) {
+    ASSERT(!instr->hydrogen()->representation().IsDouble());
+  }
+  Register temp = instr->hydrogen()->representation().IsDouble()
+      ? scratch0() : ToRegister(instr->result());
   if (instr->hydrogen()->is_in_object()) {
-    __ lw(result, FieldMemOperand(object, instr->hydrogen()->offset()));
+    __ lw(temp, FieldMemOperand(object, instr->hydrogen()->offset()));
   } else {
-    __ lw(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
-    __ lw(result, FieldMemOperand(result, instr->hydrogen()->offset()));
+    __ lw(temp, FieldMemOperand(object, JSObject::kPropertiesOffset));
+    __ lw(temp, FieldMemOperand(temp, instr->hydrogen()->offset()));
+  }
+
+  if (instr->hydrogen()->representation().IsDouble()) {
+    Label load_from_heap_number, done;
+    DoubleRegister result = ToDoubleRegister(instr->result());
+    FPURegister flt_scratch = double_scratch0().low();
+    __ JumpIfNotSmi(temp, &load_from_heap_number);
+    __ SmiUntag(temp);
+    __ mtc1(temp, flt_scratch);
+    __ cvt_d_w(result, flt_scratch);
+    __ Branch(&done);
+    __ bind(&load_from_heap_number);
+    __ ldc1(result, FieldMemOperand(temp, HeapNumber::kValueOffset));
+    __ bind(&done);
   }
 }
 
 
 void LCodeGen::EmitLoadFieldOrConstantFunction(Register result,
                                                Register object,
                                                Handle<Map> type,
                                                Handle<String> name,
                                                LEnvironment* env) {
   LookupResult lookup(isolate());
@@ skipping 1208 matching lines @@
 
 
 void LCodeGen::DoInnerAllocatedObject(LInnerAllocatedObject* instr) {
   Register result = ToRegister(instr->result());
   Register base = ToRegister(instr->base_object());
   __ Addu(result, base, Operand(instr->offset()));
 }
 
 
 void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
+  Representation representation = instr->representation();
+
   Register object = ToRegister(instr->object());
   Register value = ToRegister(instr->value());
+  ASSERT(!object.is(value));
   Register scratch = scratch0();
   int offset = instr->offset();
 
-  ASSERT(!object.is(value));
+  if (FLAG_track_fields && representation.IsSmi()) {
+    __ SmiTagCheckOverflow(value, value, scratch);
+    if (!instr->hydrogen()->value()->range()->IsInSmiRange()) {
+      DeoptimizeIf(lt, instr->environment(), scratch, Operand(zero_reg));
+    }
+  } else if (FLAG_track_double_fields && representation.IsDouble() &&
+             !instr->hydrogen()->value()->type().IsSmi() &&
+             !instr->hydrogen()->value()->type().IsHeapNumber()) {
+    Label do_store;
+    __ JumpIfSmi(value, &do_store);
+    Handle<Map> map(isolate()->factory()->heap_number_map());
 
-  if (!instr->transition().is_null()) {
-    __ li(scratch, Operand(instr->transition()));
+    __ lw(scratch, FieldMemOperand(value, HeapObject::kMapOffset));
+    DoCheckMapCommon(scratch, map, REQUIRE_EXACT_MAP, instr->environment());
+    __ bind(&do_store);
+  }
+
+  Handle<Map> transition = instr->transition();
+  if (!transition.is_null()) {
+    if (transition->CanBeDeprecated()) {
+      transition_maps_.Add(transition, info()->zone());
+    }
+    __ li(scratch, Operand(transition));
     __ sw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
     if (instr->hydrogen()->NeedsWriteBarrierForMap()) {
       Register temp = ToRegister(instr->temp());
       // Update the write barrier for the map field.
       __ RecordWriteField(object,
                           HeapObject::kMapOffset,
                           scratch,
                           temp,
                           GetRAState(),
                           kSaveFPRegs,
@@ skipping 1793 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal